Due to the increase we have witnessed over the past few years, a number of circuits have grown.
It is a fascinately constructed sense that could be interpreted in many ways.
First--what has increased? Is it the people? Or the work (translating, construction,ect...)?
Second, where is the increased? It didn't specify the UK.
A number of circuits have grown...how many? What defines 'a number'?
Also, many of our foreign-language congregations are now part of European-wide circuits enjoying circuit visits in their own language. To ensure that circuits in Britain and Ireland are a similar size...
So finally, the circuits in the UK are mentioned. And the reason given is not increase, but to create similar size circuits to that of foreign-language circuits. Of course, although this is one reason that may be valid, there are other reasons this change is really being made.
It is a masterclass of obfuscation.